/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.camera.async;

import com.android.camera.util.Callback;

import java.util.concurrent.Executor;

import javax.annotation.CheckReturnValue;
import javax.annotation.Nonnull;
import javax.annotation.ParametersAreNonnullByDefault;

@ParametersAreNonnullByDefault
public abstract class ForwardingObservable<T> implements Observable<T>
{
    private final Observable<T> mDelegate;

    public ForwardingObservable(Observable<T> delegate)
    {
        mDelegate = delegate;
    }

    @Nonnull
    @Override
    @CheckReturnValue
    public SafeCloseable addCallback(Runnable callback, Executor executor)
    {
        return mDelegate.addCallback(callback, executor);
    }

    @Nonnull
    @Override
    public T get()
    {
        return mDelegate.get();
    }
}
